Insoluble s-triazine derivatives and their use as uv filters
CA 2273984 A1 · Owner: Leduc, Madeleine · Inventors: Lagrange, Alain; Leduc, Madeleine; Richard, Herve
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention concerns novel insoluble s-triazine derivatives bearing benzotriazole and/or benzathiozole groups their method of preparation and their use in particulate form as UV filters in particular in cosmetics. The invention also concerns the application of these compounds particularly for skin and hair protection against UV radiation.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Filed November 6, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 6, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 6, 2019.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.